$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-Build.git /var/lib/mock/f40-build-1179343-21865/root/chroot_tmpdir/scmroot/perl-Alien-Build
Cloning into '/var/lib/mock/f40-build-1179343-21865/root/chroot_tmpdir/scmroot/perl-Alien-Build'...
$ git fetch origin c5a05f1280187439af39c749be0b5c92cee9aab9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Alien-Build
 * [new ref]         c5a05f1280187439af39c749be0b5c92cee9aab9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c5a05f1 Require more gating tests